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dm: get rid of GFP_NOIO workarounds for __vmalloc and kvmalloc

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In the past, the function __vmalloc didn't respect the GFP flags - it
allocated memory with the provided gfp flags, but it allocated page tables
with GFP_KERNEL. This was fixed in commit 451769ebb7 ("mm/vmalloc:
alloc GFP_NO{FS,IO} for vmalloc") so the memalloc_noio_{save,restore}
workaround is no longer needed.

The function kvmalloc didn't like flags different from GFP_KERNEL. This
was fixed in commit a421ef3030 ("mm: allow !GFP_KERNEL allocations
for kvmalloc"), so kvmalloc can now be called with GFP_NOIO.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Mikulas Patocka
2023-06-26 16:48:40 +02:00
committed by Mike Snitzer
parent 3be1622895
commit e2c789cab6
2 changed files with 1 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/md/dm-bufio.c
-17
View File
@@ -1157,23 +1157,6 @@ static void *alloc_buffer_data(struct dm_bufio_client *c, gfp_t gfp_mask,
*data_mode = DATA_MODE_VMALLOC;
/*
* __vmalloc allocates the data pages and auxiliary structures with
* gfp_flags that were specified, but pagetables are always allocated
* with GFP_KERNEL, no matter what was specified as gfp_mask.
*
* Consequently, we must set per-process flag PF_MEMALLOC_NOIO so that
* all allocations done by this process (including pagetables) are done
* as if GFP_NOIO was specified.
*/
if (gfp_mask & __GFP_NORETRY) {
unsigned int noio_flag = memalloc_noio_save();
void *ptr = __vmalloc(c->block_size, gfp_mask);
memalloc_noio_restore(noio_flag);
return ptr;
}
return __vmalloc(c->block_size, gfp_mask);
}
drivers/md/dm-ioctl.c
+1 -4
View File
@@ -1932,7 +1932,6 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern
struct dm_ioctl *dmi;
int secure_data;
const size_t minimum_data_size = offsetof(struct dm_ioctl, data);
unsigned int noio_flag;
/* check_version() already copied version from userspace, avoid TOCTOU */
if (copy_from_user((char *)param_kernel + sizeof(param_kernel->version),
@@ -1962,9 +1961,7 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern
* Use kmalloc() rather than vmalloc() when we can.
*/
dmi = NULL;
noio_flag = memalloc_noio_save();
dmi = kvmalloc(param_kernel->data_size, GFP_KERNEL | __GFP_HIGH);
memalloc_noio_restore(noio_flag);
dmi = kvmalloc(param_kernel->data_size, GFP_NOIO | __GFP_HIGH);
if (!dmi) {
if (secure_data && clear_user(user, param_kernel->data_size))